Wire zappier-edge into the live stack and add billing department APIs

Fleet now spawns the real zappier and middleware processes. Metered
timestamp/receipt/hash calls proxy to middleware when ZAPPIER_UPSTREAM
is set. CS credits, sales per-customer pricing, and QuickBooks export
are separate repos plugged into zappier-edge admin.

packages/verae-fleet/services/middleware-http.json

@@ -6,9 +6,19 @@
   "role": "middleware-http",
   "managed": true,
   "runtime": "HTTPS :3100 /zapier/v1",
-  "health": { "type": "http", "path": "/health", "timeoutMs": 800 },
-  "ports": { "healthBase": 13100 },
-  "env": { "PORT": "3100", "NATS_URL": "nats://127.0.0.1:4222" },
+  "health": { "type": "http", "path": "/health", "timeoutMs": 4000 },
+  "ports": { "healthBase": 3100 },
+  "spawn": {
+    "cwd": "../verae-zapier-middleware",
+    "command": "node",
+    "args": ["src/index.js"]
+  },
+  "env": {
+    "PORT": "3100",
+    "NATS_URL": "nats://127.0.0.1:4222",
+    "NATS_ENABLED": "true",
+    "MOCK_VERAE": "true"
+  },
   "nats": {
     "in": ["verae.zapier.jobs.events"],
     "out": ["verae.zapier.jobs.watch", "verae.zapier.webhooks.deliver"]